分布式电源在农村电力网中的优化配置方法

Distributed generation optimal placing approach in rural power network

为了提高配电网的电压质量、可靠性、经济性及能源使用效率,分布式电源(DG)在农村电力网中的应用是电力系统发展的必然趋势。该文给出了适合中国农村电力网的DG类型,提出一种在农村电力网中配置DG的方法,建立了DG对节点电压、网络损耗及短路电流影响的综合评价模型,应用节点优先等级描述DG影响的程度。在满足一定优先等级的前提下,根据年电能损失最小及配置分布式电源的年经济效益最大的原则确定DG的安装位置及容量。并且以农村电力网的实际干线为例,在安装DG总容量相同的情况下,将单点配置DG、两点配置DG及三点配置DG对节点电压的改善和电能损失减小的程度进行了计算和对比分析,结果表明,该文提出的方法改善节点电压及减小电能损失效果明显,而且对农村电力网的运行影响较小。该方法对DG在农网中的配置有着一定的实用价值。

In order to improve power quality,reliability,economical and energy efficiency.It is inevitable developing trend that distributed generation（DG）is applied in the rural power network.The type of DG adapted to our country was given,and a method of placing DG was advanced in rural distribution systems.After building integrated evaluating model to node voltage,power network loss and short-circuit current,the node priority was employed to describe the DG’s effect.According to the annual minimum electric power loss and economic benefit after placing DG,the sitting and sizing of DG was determined under certain node priority.The method proposed was applied to a real main line in rural distribution systems for illustration,based on the same total capacity,effects of electric power loss and node voltage were calculated and compared by single,double and three sites of DG.The results showed that the power loss was significantly reduced,the node voltage was greatly improved,and it was lightly affected the operation of rural power grid.The results illustrate the correctness and availability of the proposed algorithm to place DG in rural power network.